Since REST is just normal access to the URL, there is no reason why you cannot use the Qt HttpClient interfaces to talk to your Java REST interface. You just need to make the choice to use XML or JSON - both have very accessible libraries, and both are just text interfaces.
Itβs strange that you ask, Iβm doing this myself today - Iβm implementing a JSON-based REST interface in Java, and in the near future I will connect plumbing to my Qt application.
I will try to update this answer as I progress.
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